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Oilseed Crops in Western Canada Alfalfa Looper Aphids Oilseed Crops Western Committee on Crop Pests Guide to Integrated Control of Insect Pests of Crops Insect Management In Oilseed Crops in Western Canada (Canola, mustard, flax, sunflowers, safflower) John Gavloski; Manitoba Agriculture and Resource Development Last Updated: August 2021 Note: For pesticide toxicity to bees see the chapter in this guide on: "Hazards and Safeguards in Applying Insecticides to Crops in Bloom"; the link for this reads “Bee Poisoning”. Alfalfa Looper Autographa californica (Speyer) (Lepidoptera: Noctuidae) Alfalfa Looper (canola) Economic threshold - No thresholds have been determined for the alfalfa looper in canola but check threshold levels for the Bertha armyworm as a guideline. Chemical Control – IPM status of insecticides – All the insecticides registered in Canada for alfalfa looper in oilseed crops are more general in their impact on insect communities, also being harmful to pollinators, parasitoids and predaceous insects. Insecticide Rate Rate Preharvest (vol/acre) (vol/ha) Interval (days) References Chlorpyrifos1 Lorsban/ Pyrinex 0.3 - 0.4 L 0.75-1.0 L 21 1-3 /Nufos /Citadel /Warhawk References - 1. Dolinski et al., Pest. Res. Rep. 1973:136. 2. Jacobson et al., Pest. Res. Rep. 1973:137. 3. McDonald, Pest. Res. Rep. 1973:252. 1Registration of chlorpyrifos has been cancelled. Existing stocks in Canada are being phased-out. The last date of sale by retailers is December 10, 2022. All use of chlorpyrifos must cease by December 10, 2023. Aphids (Hemiptera: Aphididae) Main species of aphids on crop: Flax: Potato aphid, Macrosiphum euphorbiae (Thos.) (Hemiptera: Aphididae) Canola: Turnip aphid, Lipaphis erysimi (Kltb.) (Hemiptera: Aphididae) 1 WCCP Guide to Integrated Control of Insect Pests o f Crops Monitoring- Flax - Flax should be sampled for aphids when the crop is in full bloom, and assessed again at the green boll stage if aphid densities are near the threshold but not controlled (3). Sample 25 plants at full bloom or 20 plants at early green boll growth stage (4). Sequential sampling plans are available for aphids in flax (4). Potato aphids are easily dislodged from flax by tapping a plant against a hard surface such as a tray (4). Potato aphids emigrate from flax in mid-August. Farmers need not sample or control the potato aphid in flax after mid-August (5). Economic Threshold - Flax – The economic threshold for the potato aphid in flax is 3 aphids per plant at full bloom and 8 aphids per plant at the green boll stage (3). The yield loss of flax is 0.021 t/ha per aphid per plant for crops sampled at full bloom and 0.008 t/ha per aphid per plant for crops sampled at the green boll stage (3). Potato aphids can cause yield losses of 20% or more in flax when it reaches densities of 50 or more aphids per plant, but reduce the weight of individual seeds only slightly and has no effect on oil quality (3). Canola - As a nominal threshold, control may be justified when at least 10-20% of the stems are infested with a cluster of aphids in flowering to early pod stages. Chemical Control - Apply to canola only if aphids are found in clusters on the shoot tips. IPM status of insecticides – All the insecticides registered in Canada for aphids in oilseed crops are more general in their impact on insect communities, also being harmful to pollinators, parasitoids and predaceous insects. Insecticide Crop Rate Rate Preharvest (ml/acre) (ml/ha) Interval (days) References Dimethoate Lagon /Cygon Canola 344-364 850-900 21 2 Flax 177 437 References - 2. Wise, Pest Mgmt. Res. Rep. 1991: 48, 49. 3. Wise et al. 1995. Can Entomol. 213-224. 4. Wise and Lamb. 1995. Can. Entomol. 967-976. 5. Lamb et al. 1997. Can. Entomol. 1049-1058. Aster Leafhopper Macrosteles quadrilineatus Fbs. (Hemiptera: Cicadellidae) The aster leafhopper is the main vector of the phytoplasma that causes aster yellows, which can infect many crops including canola, flax and sunflowers. Symptoms of aster yellows in canola generally include stunting, virescence (the abnormal development of Oilseed Crops green pigmentation in plant parts that are not normally green), leaf yellowing or purpling, phyllody (the abnormal development of floral parts into leafy structures), and formation of bladder-like siliques (1). Chemical Control – IPM status of insecticides – All the insecticides registered in Canada for aster leafhopper in oilseed crops are more general in their impact on insect communities, also being harmful to pollinators, parasitoids and predaceous insects. Insecticide Crop Rate Rate Preharvest (ml/acre) (ml/ha) Interval References (days) Dimethoate Lagon /Cygon Canola 344 –364 850-900 21 References - 1. Olivier et al. 2006. Plant Disease. 6: 832 Banded Sunflower Moth – see section on Sunflower Moths Beet Webworm Loxostege sticticalis (Linnaeus) (Lepidoptera: Crambidae) Beet webworm (canola, mustard and flax) Economic threshold - No thresholds have been determined. Chemical Control – IPM status of insecticides – All the insecticides registered in Canada for beet webworm in oilseed crops are more general in their impact on insect communities, also being harmful to pollinators, parasitoids and predaceous insects. Insecticide Crop Rate Rate Preharvest (vol/acre) (vol/ha) Interval References (days) Deltamethrin Canola, 7 1 Decis 5 EC Mustard, Flax 40 - 60 ml 100-150 ml 40 (Poleci in Decis 100 EC 20-30 ml 49-74 ml flax) Poleci 81 – 121 ml 200-300 ml References - 1. Harris, Pest. Mgmt. Res. Rep. 1990:36. 3 WCCP Guide to Integrated Control of Insect Pests o f Crops Bertha Armyworm Mamestra configurata Walker (Lepidoptera: Noctuidae) Bertha Armyworm (canola, mustard and flax) Monitoring - Larvae- Monitor for larvae when plants are in the early pod stage (stages 5.1-5.2). Count the number of larvae in a 0.25m2 area in 10 to 15 different locations in the field (1). A 3-sided frame can be used to define the area to be sampled. Plants within each sampling unit should be shaken by hand, then the soil surface examined for larvae and earthen lumps and plant debris moved to expose hidden larvae (2). Bertha armyworm larvae were found to have a moderately clumped distribution in canola (1), thus samples should be from different areas of the field. Adults- Adult male moths can be monitored during June and July using pheromone-baited traps. These traps can determine the presence of adults, but do not predict larval levels in a particular field (3). Development rates: Day-degrees for the development of various stages of bertha armyworm have been determined (23). With a development threshold of 7°C, 82, 356, and 352 accumulated day-degrees above the threshold are required for development of eggs, larvae, and pupae, respectively. Economic Thresholds - A loss in canola of 0.058 Bu/acre for each larvae/m2 can be expected (4). From this, the following table of economic injury levels for bertha armyworm in canola has been calculated: Economic Injury Levels For Bertha Armyworm In Canola Insecticide Expected seed value - $/bushel Application 6 7 8 9 10 11 12 13 14 15 16 Cost - $/ac # Larvae/metre2 7 20 17 15 13 12 11 10 9 9 8 8 8 23 20 17 15 14 13 11 11 10 9 9 9 26 22 19 17 16 14 13 12 11 10 10 10 29 25 22 19 17 16 14 13 12 11 11 11 32 27 24 21 19 17 16 15 14 13 12 12 34 30 26 23 21 19 17 16 15 14 13 13 37 32 28 25 22 20 19 17 16 15 14 14 40 35 31 27 24 22 20 19 17 16 15 15 43 37 32 29 26 23 22 20 19 17 16 Thresholds apply to both Argentine and Polish type canola and not to mustards, which are higher because they are a less preferred host (5) and have a greater ability to compensate for feeding damage (6). Drought stress on canola may result in early dropping of leaves. Lack of leaves may cause more pod feeding by the larvae and affect yield more directly. Also, canola may not compensate as well for tissue loss under stressed conditions. Thus, under moisture stress, economic thresholds for bertha armyworm may be lower than indicated in the above table. Under severe drought stress, dividing the economic thresholds above by 1.48 may give more appropriate economic thresholds (4). Cultural control - Fall tillage may increase the overwintering mortality of bertha armyworm pupae (7). Oilseed Crops Biological Control- Parasitism by the ichneumon wasp Banchus flavescens may exceeds 40%, and a tachinid fly, Athrycia cineria, may kill over 20% of bertha armyworm (8). Pathogens isolated from bertha armyworm larvae include the fungus Entomophthora sp., and a nuclear polyhedrosis virus (9). Infection by the nuclear polyhedrosis virus in more than 95% of the bertha armyworm population have been recorded (10). Chemical Control – IPM status of insecticides – Chlorantraniliprole is not harmful to some beneficial insects, such as parasitic Hymenoptera (24). All the other insecticides registered for bertha armyworm in oilseed crops are more general in their impact on insect communities, also being harmful to pollinators, parasitoids and predaceous insects. Insecticide Crop Rate Rate Preharvest (vol/acre) (vol/ha) Interval References (days) Chlorantraniliprole Canola, Coragen mustard, 51 – 152 ml 125 – 375 ml 1 flax Deltamethrin Canola, Decis 5 EC mustard, 40 - 60 ml 100-150 ml 7 11-16 Decis 100 EC flax 20-30 ml 49-74 ml Poleci (canola and 81-121 ml 200-300 ml mustard only) Cypermethrin Mako Canola 28 ml (ground) 70 ml (ground) 36 ml (air) 90 ml (air) 30 - UP-Cyde /Ship 81-113 ml 200-280 ml Lambda-cyhalothrin Canola, - Matador /Silencer mustard 34 ml 83 ml 7 /Labamba Lambda-cyhalothrin + Canola, - Chlorantraniliprole mustard, 91 ml 225 ml 7 Voliam Xpress flax Chlorpyrifos1 Canola, Lorsban /Pyrinex flax 304-405 ml 750 ml – 1 L 21 17,20-22 /Nufos /Citadel /Warhawk Restrictions - Decis, Matador: Apply when temperatures are below 25C.
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